Bests & Worsts Reviews from Amazon

Just received it 3 days ago. Doesn't seem as strong as the diamond version (but could be because of the built in program where it gets stronger each time you use it for the first 2 weeks). My only issue is in trying to register it to get your promised free brush head... 1. In order to GET the brush head, you have to enroll in a program to automatically have them send you brush heads for a fee 2. NOWHERE ON THEIR SITE DO THEY LIST A "5300" MODEL NUMBER!!!! this is very strange and makes me question is this an old model that they no longer carry or ? I will update this as time goes on...